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If someone manages to reach my comment, let me explain, in detail, why this works. ^ represents that starting character of the string. [aA-zZ] makes sure that the starting character is in the lowercase or uppercase alphabet. \\w{7,29} represents a check to make sure that the remaining items are word items, which includes the underscore, until it reaches the end and that is represented with $. The {7,29} represents the 8-30 character constraint given to us minus the predefined first character.
Valid Username Regular Expression
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If someone manages to reach my comment, let me explain, in detail, why this works.
^represents that starting character of the string.[aA-zZ]makes sure that the starting character is in the lowercase or uppercase alphabet.\\w{7,29}represents a check to make sure that the remaining items are word items, which includes the underscore, until it reaches the end and that is represented with$. The{7,29}represents the 8-30 character constraint given to us minus the predefined first character.